NOISE CRITERIA CURVES
6
4
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
A
VE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling :DB35
:
WB24
:
MU-A12YV-
E1
COOL
FUNCTION
49
SPL(dB
(A)
)
LINE
OUTDOORUNIT
MICROPHONE
1m
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
A
VE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : DB27
:
WB19
:
MU-A07YV-
E1
MU-A09YV-
E1
COOL
FUNCTION
45
SPL(dB
(A)
)
LINE
OB330-1.qxp 04.3.2 0:57 PM Page 6
